Ghost cancelling method and apparatus which perform a correlative operation to speed processing

Claim 2

A ghost cancelling method comprising the steps of: performing a correlative operation between an output video signal y(n) and a ghost cancelling reference signal r(n) to provide a correlative operation result C ry ; determining an initial filter coefficient h(0) of a transversal filter using the correlative operation result C ry ; supplying the output video signal y(n) to the transversal filter to generate a ghost correction signal; and mixing the ghost correction signal with an input video signal x(n); wherein said performing step and said determining step are performed in accordance with the following equations: ##EQU10## where C ry is a correlative function between the reference signal r(n) and the output signal y(n), K is a length of the reference signal r(n), N is a number of video samples, and R is a correlative function of the output signal y(n); and wherein the input video signal x(n) is initially equal to the output signal y(n).

Claim 3

The ghost cancelling method according to claim 1, wherein, after the initial filter coefficient of the transversal filter is determined, a next filter coefficient is corrected based on an error signal between a ghost canceled video signal output and the ghost cancelling reference signal.

Claim 4

A ghost cancelling apparatus comprising: a transversal filter for generating a ghost-correction signal; a ghost correction portion that receives the ghost-correction signal nd an external video signal input x(n) and mixes the ghost-correction signal with the video signal x(n) to provide an initial output; a filter coefficient correction portion that receives an error signal e(n) indicative of an error between the initial output from the ghost correction portion and a ghost-cancelling reference signal r(n) and that supplies an input to said transversal filter for correcting a filter coefficient generated by said transversal filter; a correlative operation unit which performs a correlative operation between the initial output and the ghost cancelling reference signal to provide a correlative operation result C ry ; and an initial filter efficient calculation unit which receives the correlative operation result C ry , calculates an initial filter coefficient h(0) on th basis of the correlative operation result C ry , and outputs the initial filter coefficient h(0) as a further input to said transversal filter; wherein the correlative operation result C ry and the initial filter coefficient h(0) are given by: ##EQU11## where K is a length of the reference signal r(n), N is a number of video samples, and R is a correlative function of the output signal y(n); and wherein the input video signal x(n) is initially equal to the output signal y(n).

Claim 5

A ghost cancelling apparatus comprising: a transversal filter for generating a ghost-correction signal; a ghost correction portion that receives the ghost-correction signal nd an external video signal input x(n) and mixes the ghost-correction signal with the video signal x(n) to provide an initial output; a filter coefficient correction portion that receives an error signal e(n) indicative of an error between the initial output from the ghost correction portion and a ghost-cancelling reference signal r(n) and that supplies an input to said transversal filter for correcting a filter coefficient generated by said transversal filter; a correlative operation unit which performs a correlative operation between the initial output and the ghost cancelling reference signal to provide a correlative operation result C ry ; and an initial filter efficient calculation unit which receives the correlative operation result C ry , calculates an initial filter coefficient h(0) on th basis of the correlative operation result C ry , and outputs the initial filter coefficient h(0) as a further input to said transversal filter; wherein the correlative operation result C ry and the initial filter coefficient h(0) are given by: ##EQU11## where K is a length of the reference signal r(n), N is a number of video samples, and R is a correlative function of the output signal y(n); and wherein the input video signal x(n) is initially equal to the output signal y(n).